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Fluorocytosine

CAS NO. 2022-85-7
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Product Name

Fluorocytosine (Flucytosine)

(5-Fluorocytosine / 5-FC / 4-Amino-5-fluoro-2-hydroxypyrimidine)

CAS NO. 2022-85-7
Formula & Weight C4H4FN3O (MW: 129.09)
Chemical Structure Fluorocytosine Chemical Structure
Specification (EP/USP)

Appearance: White to off-white crystalline powder

  • Assay (On Dried Basis): ≥ 99.50%

  • Loss on Drying: ≤ 1.5%

  • Residue on Ignition: ≤ 0.1%

  • Heavy Metals: ≤ 20ppm

Impurity Profile (High Purity):
  • Cytosine: ≤ 0.02% (Limit is far below pharmacopeia specs)

  • 5-Fluorouracil (5-FU): ≤ 0.01%

    Total Impurities: ≤ 0.03%
Clinical Applications

A potent fluorinated pyrimidine antifungal API, widely used in combination therapies:

  • Systemic Infections: Highly effective against systemic candidiasis and cryptococcosis (e.g., Cryptococcus neoformans meningitis).

  • Synergistic Therapy: Often formulated or co-administered with Amphotericin B for enhanced efficacy.

  • Dermatomycosis: Effective against chromoblastomycosis caused by sensitive strains of Phialophora and Cladosporium species.

Packaging & Storage Packaging: 25kg Cardboard Drum with double PE liners.
Storage: Preserve in tight, light-resistant containers. Store at controlled room temperature (avoid excessive heat).

Need High Purity 5-FC for Formulation?

Royalchem supplies Pharmaceutical Grade Fluorocytosine with industry-leading impurity control (5-FU ≤ 0.01%).        
Reliable Supply for GMP Manufacturing.

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